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WARNING: this is an experimental feature. QEMU will slow down when using it. USB devices requiring real time streaming (i.e. USB Video Cameras) are not supported yet.
ls /proc/bus/usb 001 devices drivers
chown -R myuid /proc/bus/usb
info usbhost Device 1.2, speed 480 Mb/s Class 00: USB device 1234:5678, USB DISK
You should see the list of the devices you can use (Never try to use hubs, it won't work).
usb_add host:1234:5678
Normally the guest OS should report that a new USB device is plugged. You can use the option -usbdevice to do the same.
When relaunching QEMU, you may have to unplug and plug again the USB device to make it work again (this is a bug).